I use Heat Beads in my Cobb, but stick to lump for the Kamado, which is so efficient charcoal lasts a very long time. I could probably get up to 36 hours of low and slow using lump wood charcoal without having to refill.

Just checked it out its £5 a bag but deliver for 4 bags was £15. they did say free deliver for orders over £50 but it was still coming up at £15 even ordering 10 bags

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Delivery is only £3.95 for up to 30kg ie 3 bags after that it's £15 for up to 500kg ie 50 bags. If you want to buy less than 10 bags it's cheaper to buy therm in separate orders of 3. I assume the free delivery is for orders greater than £50 that weigh less than 30kg (edit-it confirms this on the delivery info page)